TerryMcP,
Thanks for your question.
Fundamentally there is no reason that ColdFire can't support GigE. We've just been watching the market and price points and at this time haven't seen a huge demand for GigE.
We would be interested in your application and needs, and I would welcome any data you have related to GigE needs. Feel free to send a private email if you like.
We do have GigE coming. I can't pre-announce a new chip, but I can say that we are collecting inputs and have plans.
Also...in relation to the V5. Fundamentally, the V3 and V4 could handle GigE as well, since the primary problem with GigE is memory bandwidth limits. The V5ex core utilizes 64bit internal buses, so it could minimize the required clock rate. The V3 and V4 traditionally (except for the 547x and 548x) use 32 bit bus. So to do GigE right, a good solid memory subsystem is required. So you could see GigE on V3 and/or V4/V5 systems at some point in the future.
Does this help?
-JWW