It was a rumor, this is the original source I believe. 

http://www.neogaf.com/forum/showpost.php?p=46631873&postcount=1

I don't think there ever was a deal was there? It certainly didn't stop them and a 3 year contract on a franchise that takes 3-4 years to make would, imo, be pointless.

I suspect that its just because Nintendo has had the 3 best selling platforms in Japan for a long time now. Ds, Wii, and 3DS. Its a shame more companies cant put their bias aside and put their AAA quality titles on their platforms.

Nope, still not suspicious.

Monster Hunter was Sony exclusive from 2010 to 2011. So did Sony have to make some kind of deal to convince Capcom to make a game for PSP and port it to PS3?

The Wii U port isn't weird because it's just a port from the 3DS game, and it was a launch title. At the time the game came out, the Wii U was NOT the worst-selling console anywhere.

The PSP was not the best-selling console anywhere for any significant length of time. Capcom wisely chose the 3DS knowing that Nintendo would dominate the handheld market this gen just as they have for the past 30 years.

Nope, still nothing suspicious about any of this.

they wont though, multiplat is definitely possible, sony only is terrible for capcom. It'll lose crazy sales

Too late Sony has lost the battle of the handhelds, it might craw is way up the charts but it'll never come close to the 3DS numbers :/ Battle of the homes consoles now that'll be a different story :)

I don't think there was ever any deal. You have a popular franchise, why not put it on the most popular handheld? Hey, its also super easy to port it across to the wii U! Lets make a few extra dollars there as well! Capcom is banking with Nintendo on MH. Especially in the eshop. Why mess up a good thing? Im curious to see which version of frontier sells the best between PS3 and Wii U

There isnt any deal,
http://mynintendonews.com/2013/08/25/capcom-explains-why-the-monster-hunter-series-migrated-to-nintendo-3ds/

So this is based on a rumor?

Companies can also lie.

Finally, after 3 years, Capcom will be able to tap into that 10% of the market they've been missing.