343 has been very quite lately about the forge update that is coming. From what they have shown we will be able to save our welds and groups. But they havn’t said when this update is coming out and what else will be included (maybe a phantom and spirit in forge?).
The latest community bulletin mentioned it, but no hard dates yet. My personal thoughts are between mid to end of August
https://www.halowaypoint.com/en-us/news/community-update-the-finals-countdown
> First up, teams in every corner of the studio are hard at work on the next content release for Halo 5, which includes plenty of new goodness. The Halo 5 Content Browser and the release of Forge on Windows 10 will be landing around the same time, and we’ll be talking about all of these and more within the next month. I do think you’ll like it.
There is suppose to be a Forge map coming to arena soon.