With the blades being most popular with the limited population of scratch golfers, professionals and very good amateurs, the market and the technology does not make sense for them to release new versions on the 2-year cycle as the other irons. Titleist does not believe in just making cosmetic changes just to increase sales. It would not surprise me if they did not do a new release in blades until at least the 2025 version iron release or maybe not even then. Best indicator is to watch what happens with the pros as they always get "tour seeding" of new irons a few months before the production release.

Being fully cast, there isn’t much that can be done to make a significant change. If they made it a multipart hollow casting and added tungsten weights to move the COG/MOI, they’d call it a T100.
There are rumors of a new MB, but they have been making one-offs for folks like JT. Basically changing the amount of offset. Since the current 620 series has missed the last 2 T series updates, a next release could go in any direction. Looking back on the Eye-2, there’s no telling how many years these could remain in production. No reason to make a change if it isn’t an improvement.
Doubtful a new release would change the PW loft. The 620’s are for serious golfers that aren’t looking for a player’s iron with modified lofts (a.k.a. T150).

Thanks all. I'm going to keep playing my current irons this season and see what happens. Planning on a whole new bag for 2025 but I would be frustrated if I bought them now and then new ones were released in a few months. So I guess we'll see what happens. Thanks for the advice guys!