I do think we're going see at least one update for September since we do still have a backlog of Digimon besides Negamon that still need to be added.
Yeah, there are like 30-35 Digimon which are quite the low-hanging fruit, with portrayals in more than one form of (recent) media (a combination of TCG, anime and/or videogames). These Digimon should really be added sooner rather than later, we've waited long enough
- Sunmon and Moonmon;
- Dokunemon and Modoki Betamon;
- The rest of the Arkadimon-line;
- The Sistermon Awaken forms;
- Black Galgomon, Black Rapidmon, Red V-dramon, Kyubimon (Silver) and Taomon (Silver);
- Pile Volcamon;
- Raijinmon and Raidenmon;
- The rest of the Olympus XII, their left-over forms and affiliated Digimon: Bacchusmon, Ceresmon (+Medium), Junomon (+Hysteric Mode), Jupitermon Wrath Mode and Plutomon;
- Omegamon Zwart (Defeat);
- Some left-over Shoutmon variants.
It will get interesting afterwards; Will they add obscure Digimon like Blikmon, or King Whamon? Or are such Digimon doomed in semi-canonicity and/or obscureness? Or obtainable Digimon exclusive to some of the videogames, like the Chronomon-line? I will personally be overjoyed if that particular family gets added.
This year quite a few very interesting and unexpected profiles got added: Yoxto!Yoxto!mon, Atamadekachimon, Minidekachimon, Kodugumon, Trailmon, Great King Scumon, Burgamon (Adult) and Burpmon, so I have good hopes for the rest. The question is; How long will it take, and how much space will the upcoming anime take in the form of new entries? Ghost Game might use a lot of older Digimon in its episodes, or be the second Xros Wars with lots and lots of new designs. We've already seen Baby I and Baby II forms of Gammamon, so the series might be a bit more 'traditional' on the Digivolution part (I hope this is the case). But will this leave space for these legacy-Digimon I mentioned earlier? The low-hanging fruit, and the more obscure ones? It will be interesting to see.