I will either buy mba 13 ultimate + thunderbolt display now or wait for 2012 mbp 15. I use my brother's mbp 2011 for now Is it worth to wait?
yes, I would. I got some cash saved I would buy that in US (mba, and display) Here it is almost 3000$ all together
If you've got a good computer to last you until mid-2012, then go ahead and wait. Unless you really want one of your own and your brother wants his computer back.