I'm not really into buying consoles on release. The PSV was the first I've ever done. I usually wait until there is that one game that I must play before I do that.
For the X360 that was Halo 3, for the PS3 that was actually the list of RPGs that were coming (such that I decided on PS3 for RPGs even when they were multi-plat on the X360), for the Wii that was Zelda.
This gen things might change a little. Depending on how quick they get Gaikai and PSN compatibility working may determine whether I get PS4 before RPGs begin to hit the PS4 hard. I am tired of Fable and Halo so at this point I do not see a reason yet for X720, but since the details are low I just dunno what other new games they may have that would force to eventually buy it. The Wii U is just unacceptable at this point unless they wow me to death with the next Zelda, the prev WiiMote driven Zelda left me so disappointed I did not even complete them (I was able to get through even Wind Waker for pet's sake).