Future new profession/Elites
Hopefully not soon. They are still struggling to balance the elites and revenant from HoT, 6 months after they were released plus at least a year in development. Each new class means even more trouble.
A-net is more likely to introduce more elite specializations to further customize the current professions than add a new profession. especially now the current ones are balanced in the way that there are 3 soldiers, 3 adventurers and 3 scholars.
Other than that as Fogleg said, there are still some balance issues as the Elite Specialization is still quite strong, but I believe a lot of this will be nullified with the release of multiple Elite Specializations.
I see it as being alike skills and elite skills. Naturally bringing an elite skill packs more punch than a regular skill. if we had 3 skill slots, for either 3 utility skills or 2 utility skills and 1 elite. most would naturally choose the 2 utility skills and that 1 elite.
If we had 2 elites however, it would open up more customization again.
TL;DR
Elite Specializations are strong, but they’re intended to be. these are the first we’ve seen, more are likely yet to come.
a small, casual Guild with a play as you want style.