The POTF2 series that came out just before the release of EPISODE I was the Flashback series. This consisted of Luke Skywalker with floppy hat, R2-D2 with launching saber, Darth Vader, Obi-Wan Kenobi, Chewbaca-Hoth, Princess Leia-Ceremonial Gown, C-3PO from the Jundland Wastes, Aunt Beru, and Anakin Skywalker. You'll recall that these had the flashback cards that showed the characters as they would appear in the prequels, or it would picture a predecessor.
The POTF2 CommTech series was the next POTF2 line, and it coincided with the release of the EPISODE I line. If my memory serves me right, the first CommTech wave, with Han, Luke, Greedo and the Jawa with Power Droid came out a few months after EPISODE I launched. I think all in all there were about 3 waves of POTF2 CommTech figures.
I guess it can be kind of confusing since the EPISODE I line was so big, and the POTF2 Commtech line seemed almost like an afterthought. Anyhow, the chips made for good stands, and some of them sounded decent, but most didn't.