The games have no way to distinguish a RNGed pokemon from a normally caught one - both are generated within the normal confines of the game, and I highly doubt that there has been or ever will be recalculation of IVs after transferring. The only similar thing to happen is the change in pokemon ability depending on its Class, and it has to evolve for the change to even take effect....which is the reason why I always buy both games. (Well, it'll be 3 games in this case because I'll also be getting an extra White for my girlfriend)
There was some hint about limitations on the Pokemon you can transfer to BW, so its quite possible you won't be able to transfer the old TMs over. My big concern is the (highly unlikely) possibility that they'll prevent the trading of RNGed Pokemon somehow... or possibly recalculate IVs after the transfer making all of my hard work for naught.
*goes back to RNGing for a Jolly Wondercard Jirachi anyway*