With 5.1 increasing the level cap to 60, PotD (pre-made/solo), Daidem and the HW Map dungeons should all be accessible. Later in the patch cycle (5.3?) the level cap might be increased to 70 which should unlock HoH and Eureka.
I believe weapon damage isn't used in the BLU damage calculations. They have a different damage formula that based on the Blue's INT and the potency of the ability. This was done so that they didn't have to create a bunch to new weapons.