While I think of it (from being reminded about it from seeing someone's Gen2 comic collection in the acquisitions topic), the first ever reprint of the 5-issue lead in to the Gen2 comic, comes out March 27th, as Volume 14 (of 15) of the GIJoe reprint series. (after 4+ years, the entire original GIJoe comic series is finally almost complete)
It includes artwork by Andrew Wildman, and several classic Transformers characters... and gave us a taste of the slaughter we'd be expecting to see in the Transformers Gen2 comic (which only lasted 12 issues).

The Gen2 comic has been reprinted before (by Titan, and maybe IDW), but the 5 issues of the GIJoe comic (138-142) that features them and sets up the story of the Gen2 comic (including why Megatron suddenly has a new form), has never seen a reprint, making it difficult to find that 5 issue prelude cheaply.
For those who bought the Titan TPB of Gen2, or even the original issues, now's your chance to complete the entire (Marvel) Generation 2 comic Universe.

You can pre-order it at your local comic shop, or check out Amazon.com (if Bookdepository don't have it).
It has Megatron & Cobra Commander on the cover, so should be easy to find. But remember - Volume 14 of the GIJoe Classics TPB series.

(from being sucked into the GIJoe comic through the UK Transformers comic, I've been collecting these reprints, and it is good to see that IDW will be able to release the entire series, as the later issues of the original comic can be very expensive)