Hexadrive may be best known for making The 3rd Birthday with Square Enix, but their specialty is doing HD remakes. They worked with Capcom earlier on Okami HD, helped Nintendo with The Legend of Zelda: The Wind Waker HD, and made the patch for Zone of the Enders HD.
Hexadrive also developed Monster Hunter Freedom Unite for iOS and upscaled the PSP game 24 times to 2048 x 1536 pixels for iPads.
The user interface has four times the resolution than the PSP version. Hexadrive also improved the texture quality for backgrounds and this game looks fantastic on iOS.
The biggest change may be the target camera system. There are three options Type 1, which was made just for Monster Hunter Freedom Unite for iOS is a camera that follows a boss monster. Type 2 is a the target camera option from Monster Hunter 3 Ultimate and no target camera is regular Monster Hunter where you control the camera.
Monster Hunter Freedom Unite for iOS also supports online multiplayer through GameCenter.