Yesterday, HTC released the kernel source code for 8 devices in total: 7 phones and 1 tablet. On the phone side of things, we now have source code for the original HTC Incredible as well as the Incredible S, the newly released AT&T HTC Vivid (which had prompted a trademark lawsuit threat from the porn company of the same name). Also, there is code for the Desire S, the Sensation, the Explorer, and one of the HTC Facebook phones, the ChaCha (because everyone is clamoring for a custom ROM on that phone.)
As far as the tablet, this one could be interesting because it's the HTC Flyer. It would be pretty awesome to see an Ice Cream Sandwich ROM built for that.