Most of the European manufacturers are developing hybrid models for sale in the near future and most of these will be diesel (Porsche being the notable exception).

As for which vehicle in the VW range will get the hybrid option first, it may be the Golf as they recently displayed a diesel/electric Golf at the 2005 Challenge Bibendum (according to reports, it looked production ready).

http://mysite.wanadoo-members.co.uk/ecotech/ecot.htm