I'm with you Tim, I'm rather suspicious of their motives regardless of what they claim. Despite the labor of love from the emulation community, it does seem rather coincidental they suddenly bob up like this without warning.
I read an interesting comment though-they surely couldn't claim any royalty/ownership over 99% of the games out there, as CBM were NOT a publisher ala Sega/Nintendo, & don't have any right to claim anything on them. (apart from the handful CBM made themselves, which you'd count on one hand)
If there's nothing for the emualtion community to worry about, why go spreading fear & panic over "unauthorised use"?