Apparently, there is going to be a new Digimon anime, Digimon Savers, coming out soon. So far, there has been no official announcement about the plotline or characters, but there is speculation that it might, in fact, be a continuation of Digimon Tamers (the 3rd season).
More information, along with a magazine ad with preliminary character sketches, can be found here: http://www.yeysubs.net/dejiko/
Personally, if this actually IS a continuation of Tamers, then I will be VERY happy, as it was always my favorite Digimon series. But who knows?