POLE7645: They had a very good reason for New Vegas. They had a very short developement cycle (13 months while the average game is 2 years) with a TINY amount of time for bug testing (barely a month). The fact that they manage to produce such a great game (albeit one that required intense patching afterwards) is amazing.
Now that they have their own schedule, I'm sure that they can pull it off.
McDon: That has already been said a while ago, you also forget they already had an engine and gameplay already made, making the 13 months compared to 2 years pretty irrelevant.
In case you haven't noticed, in Fallout New Vegas, the skill system (and the perks) has been extansively redone. And beside, most games nowadays use an already done engine (to save money and time). 13 months is still a very short developpement time for a game with that amount of content.