I know for a fact that the virtuoso roms (2 of them) are available for the P2k. Never heard of the vintage keys, but most likely the samples are on it or on one of the other roms.
The virtuoso and P2k are the same exact machine (thats with P2k OS 1.21. It's a free upgrade). The virtuoso just comes with the 2 orchestral roms (that are available for the P2k) while the P2k comes stock with a composer rom.
A little later in this month Emu plans on releasing OS 2.21 for the P2k which adds arpegiattors and other things. 32 simultaneous arp's sounds mighty nice to me!
I hope this helped
Justin