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Gnomes, Kobolds, Aasimar, and Tieflings are definitely overwhelmingly the four races that have been requested the most (by what I've seen) [followed closely by 'all other Eberronean races'].
Aasimar and Tieflings are just glorified humans- and thus would make ideal iconics.
Gnomes and Kobolds, though, are pretty distinct [especially if using all the various variation content for kobolds, which you really need to do to make them viable].
Rowan mentioned [gnomes and kobolds] were in consideration a few producer's notes back, so hopefully they've managed to make some progress since then.
And yes- DDO has the best build versatility of any game. It's one of the main reasons we love it.
But that doesn't mean it can't add more.
Well, I definitely'd like to see them throw out the occasional fresh iconic every so often, at the least.
When Iconics were released, I got the impression that part of the reason they were created was to allow an easier way of getting out new racial content [ie, by simply art-tweaking to add in subraces]. Likewise, I got the impression that the devs were intending to keep releasing them on a semi-regular basis.
Kinda been disappointed that I haven't seen any released-
Though if that means they've been putting effort into Gnomes and Kobolds, that's definitely O-K.