Hi AndrueC... congratulations on your (soon to be finalized) purchase. The Civic IMA is a great way to minimalise the carbon tax, eh ?
Honda does content their cars differently for each continent. Generally, in the US, we see less features relative to our global counterparts (we only have 1 CD capability in our players, for example - we would have to move up to the Accord to gain six in the dash player). However, they're usually priced more attractively as a result. So I'll comment relative to the US / N. American cars, not knowing every last feature of the UK ones.
Engine braking - you'll find it more pronounced than coasting down in an automatic, but less so than a standard shift (especially in the lower gears). In the US, the car is only available with a CVT now - no 5MT option as in the past. If you're driving the car in order to use the least amount of petrol, you want the car in the highest possible gear at the lowest RPM without lugging the engine. The CVT takes care of this for us, as it has infinitely variable gearing between it's upper and lower boundaries.
Generally, the higher the car's speed, and the abruptness with which you disengage the throttle, controls how much energy the AC motor will put out in regenerative mode. I drive gently, so as to use less petrol, and generally see about 3-4 bars on the 'charge' meter lit up when I coast down from an initial speed of 40mph. If I then apply the brake, I'll see the charge meter increase to about one bar shy of maximum.
Note that at lower speeds (whether you coasted down or not), you'll see much less 'charge' - sometimes as little as one bar until you brake (where you'll then see about 3 bars worth). However, if you run down the traction battery's state of charge, by using more assist than regen, the IMA's electronics sense this, and tells the AC motor to act as a generator even when you're accelerating / cruising. You'll notice an efficiency decrease during this period, because the engine has more load upon it to deliver the same desired speed / power. The LDA2 1.3L that we use here in the States is a very load sensitive engine, but at a cruising speed, it's very, very efficient.
Waiting when stationary - In the US, if you remove your foot from the brake, the engine will restart. Period. You may shift to neutral and still be able to keep the engine off, but if you remove your foot from the brake to cancel the brake lights, the engine *will* restart. Don't worry about the poor sod in back of you. You're decreasing emissions (and improving on your amount of petrol being used) by having that engine off while stopped. Don't defeat it.
CD Player - as mentioned beforehand, the US / Canadian in-dash player only can hold one disc. However, other N. American Hondas can hold six in the dash. You feed the discs in one by one, by pushing a 'load' button and waiting for the system to tell you when it's ready to accept the next disc. You can eject them one by one, in any position (ie; you can eject *only* disc four, if you choose to, without having to unload any others), or all at once. When one disc finishes playing, the unit switches to the next CD in sequence, so yes, it is an autochanger.
In N. America, we have to purchase an auxillary changer that mounts in the trunk or in the center (arm) console, if we want to have multi-CD capability. However, our USDM CD players can read MP3 / WMA content, and we also get an AUX jack - thus, you see many blokes just burning their own CDs, since they can fit many hours of content on that single CD.
Windscreen - we don't have a reflective one in the US model. Our side glass does have a special UV coating on it, relative to the non-IMA Civics. In your case, you may have a problem, and you may not. In the event that you do, and you cannot receive GPS reception at all, many manufacturers do sell an externally mountable antennae that counters the effects of these windscreens.
Enjoy your car, and please do post some pics when you get it - I'd like to see the differences between the US / Canadian saloon model and what you lads get over there. I saw some pics of the non-IMA UK model and it looked like a spaceship
Acronym glossary (for our US-based members who are challenged):
US: United States
CD: Compact Disc
N. : North
UK: United Kingdom
CVT: Continuously Variable Transmission
5MT: 5-speed manual shift transmission
RPM: Revolutions (of the engine) per minute
AC: Alternating Current
LDA2: Honda's engine code for the 1.3 litre engine with IMA assist, installed in the 2006-up Civic Hybrid.
L: Litre
USDM: United States Domestic Market
MP3: MPEG1 Audio Layer-3 -
Compression scheme used to transfer audio files via the Internet and store in portable players and digital audio servers
WMA: Windows Media Audio
AUX: Auxillary
UV: Ultraviolet
GPS: Global Positioning System