The Rabbit is replaced in the fall with the Golf. 2.5L, TDI, and maybe TwinCharger 1.4L or something further off.
The Jetta is replaced with two mildly "decontented" for North America sedans, sort of. Because of this the Golf becomes a Golf family, with the Jetta Wagon becoming the Golf Wagon joining the 3dr, 5dr, GTI and perhaps even a Golf Plus but wouldn't hold my breath on the latter with a Polo Plus and Tiguan on sale.
My feeling is there will be two Jetta replacements (one hopes they're smart enough to continue the model name), the first being less expensive than the current Jetta and new Golf, but larger. So the Golf hatch is more expensive than the new compact sedan, reverse of today. This could be the new stretched Polo sedan for all I know. And a sedan larger still specific for North America - which could be named Jetta or whatever mid-sized sedan larger than today's Passat sedan. One or both will have TDI power available. The Passat will continue as a niche vehicle but perhaps in Wagon and/or CC variants only.
Polo Plus or what have you would slot below Golf and assuming priced similar to the new compact.
All of the above I have no real inside information source on other than what I've read/heard informally. And with VW anything can happen.