Sol cap remains, perhaps the new dungeons will reward more sols and myths but it's way too soon to either A. Remove the Sol cap or B. And/or introduce new tomes.

I also doubt they will raise the cap. 450 is perfect for this. You can get an accessory every week and an armour piece every two weeks. Keep in mind, some of us had to deal with a cap of 300 myths back in 2.0. 2 Weeks per accessory piece and small armour piece, 3 for pants/top. Yeah.