That door has been there since before wipe, I'm pretty sure that was always it's intended purpose, and it probably has that level requirement so level 1's don't donate a grand and merge T5 and roflstomp everything. Considering T5 is waaaay more powerful then T4. In terms of the update next Friday, I'd like to see some moar content besides Blasted Lands "click to level". Maybe a boss that requires a team to kill that isn't a world boss or something along those lines. Blasted Lands just seems kind of boring especially with the new stage of experience at 10k being lowered.
The Super Fishing Rod also seems kind of pricey for what it does, doubling your catch rate is nice, but in the end you can only spawn the good stuff once an hour anyways and it's still going to be one worm per catch, so the added speed really isn't that necessary. Maybe a proc for it to not use a worm or only doubling the chances to catch the boss would be nice.