Probably worth remembering that:
A, Maxis are working from home,
and B, the next pack is in the "voice/sound recording" stage (usually the last stage of development before a game is ready to ship). (Source: https://simscommunity.info/2020/03/04/the-sims-4s-9th-expansion-pack-is-in-the-final-stage-of-production/)
So, a patch for April is most likely coming, and it's pretty likely to be a pre-GP patch (if not April, then the May patch will be the pre-pack patch)
Maxis, as far as we're aware, is continuing on, business as usual.
Coronavirus probably created a few bumps in the road (which is why we didn't get a March patch, but we did get Gallery maintenence), but I don't think we'll see any significant delays. Adjusting to working from home probably accounted for a bit of a delay in development, but it's not like the game's been cancelled or anything crazy.
