Every other HD upgrade has come in sets. This is the only one that isn't. It might be because X-2 was hated, or Squeenix intends to sell them individually for $40-$50 a pop ( For example, they might sell the Kingdom Hearts games separately ) . Hell, a HD collection they published came with three games for 40 ( The Tomb Raider Trilogy, and one of the games was from this Gen ).
I'd want it, more out of principle than actual interest in the game itself. If they don't include it or do an HD upgrade, I wouldn't count it as a loss, though.