If your ordering the part directly from Apple you'll get the updated logic bd (rev2) as Apple doesn't have a different P/N for the newer version or sell the older part.
If you are ordering the part from another source they could be stripping units down to sell the parts so you won't know until you put it in and run the special diagnostics program to test out the GPU.
Apple is still replacing defective logic bds when MacBook Pros with the problem are brought in to the genius bar. You may need to speak with the support manager and even point him to this Apple extends Nvidia repairs. And if that fails show the manager this Seattle Rex VS Apple
Be polite, and explain you just want your Mac to work without a known defective chip. Of the 10 or so people I've spoken with most have gotten their systems repaired without having to go much further (I've had 6 systems repaired without any difficulty). I should state there are some people who's systems had other problems thinking it was the GPU issue and Apple rightly so did not replace the GPU for them and they needed to pay for the repairs.
If you find you just can't get your defective GPU replaced, there maybe a class action suit. Remember you and Apple both loose if this happens (only the lawyers really win) Possible class action. If you really want your Mac to work it's better to go to small claims court as Seattle Rex did. As Apple has already lost a case, using Seattle Rexs' court records in your case should swing it in your direction. But, just because he won your Judge may think differently. So be careful in how far you go here. If you can bargain with Apples lawyers before going to trial thats best. Good Luck!