My brand new MBP 17" comes with Mac OS X 10.6.7 (grey, machine specific disc) and at least this version of Mac OS X includes FaceTime (HD). So i think Lion will come with FaceTime (HD), which runs only on supported Macs.
FaceTime is included in the developer preview's of Lion, but that doesn't mean it will be included in the final release. Apple may just want devs to test it out on Lion.
FaceTime is included in the developer preview's of Lion, but that doesn't mean it will be included in the final release. Apple may just want devs to test it out on Lion.