Have Apple forgotten about this product? It still has non-gigabit ethernet and Wireless G.
I was personally surprised that neither the AEBS nor the

tv incorporated the AirTunes feature.
That being said, I don't think it's dead yet. As quickly as Apple is moving into video, audio is the market they
own. So they need this feature, I think, although since most of us have our TV and receiver relatively co-located, it'd be easier if one device did both.
However, as for what you said... 802.11n is a gimme. Gigabit ethernet... I think you're overestimating the worth of that. The Airport Express's one port is a WAN port by design. Your home WAN-side connection is not running faster than 100mbps.... You can use it as a LAN-side connection, and granted in principle 802.11n can occasionally exceed 100mbps. But it's still a single LAN port, in this case. Unless you have two LAN ports (so that you can do
wired intranet transfers between two computers), it seems unlikely you'd benefit from gigabit ethernet.
I guess they could just add it for the hell of it, though....