They will still do exclusive games for ps3, I think sequels...
"PlayStation fans need not panic, however. This doesn't mean that franchises like Ratchet and Clank and Resistance will suddenly appear on the 360. Insomniac Founder and CEO Ted Price told IGN, "We definitely take a measured approach to what we do at Insomniac. We've never made overnight decisions about things and we've been thinking about going multiplatform for a while and planning it, and we're now at the point where we can do that, as well as continue our relationship with Sony that we've maintained for the last 14 years." Price continues by noting that Insomniac is "just as dedicated to Ratchet and Clank and Resistance as [it] ever [has] been."
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Source:
http://ps3.ign.com/articles/109/1092483p1.html