You are aware that's not a special bundle, right? Amazon likes to list "Frequently Bought Together" items, but they're still at their normal prices. This is just their way of upselling, by saying "If you like this game, you might like these other ones too... We'll make it easier to buy them at the same time."
I have no intention of getting Lightning Returns. I may purchase X|X-2 HD Remaster, but only if it goes down to $30 USD, and only because I lost my PS2 copy of FFX. I absolutely intend to buy Kingdom Hearts HD 1.5 Remix, because the Final Mix content never got released in the US before and this is worth repurchasing the game to me.
I'm curious about the graphics in 1.5, because I've read that they lost the original assets and had to recreate them. If this is true, they may look significantly better than they actually did in the original game, not just upscaled textures as is common in HD rereleases. Perhaps more importantly, there's a strong chance that they've copied camera code from a more recent game. They haven't said anything about the camera, but it was absolutely horrid in Kingdom Hearts and Kingdom Hearts Re:Chain of Memories. I can only hope that they've borrowed something more recent, such as Birth By Sleep's camera.