"Summer line-up" means...

Ep, GP, SP. Like they revealed a year ago.

June 2020 EP Eco Lifestyle
July 2020 SP Nifty Knitting
Sept 2020 GP Journey To Batuu


https://twitter.com/SimGuruDuke/status/1247207903582281742?s=20

Last day of summer is September 22 so also like last year we'll probably get another EP in the fall.
Snowy Escape released November 13, 2020.

Can't wait for tomorrow!