It seems like the question about a possible new skill cap have got it's answer. A big thank you to Elevenicy for posting this:
From the new FAQ
It's sticked at the top of recent updates.
"Will you be raising all skill caps to level 120? "
There are no plans to change any of the other skills at this time.
I believe Mod Emilee, but of course we can still keep discussing
What do you think, is this good or bad? Will level 120 stick out with all the other skills at a maximum of 99? Or is Dungeoneering such a nice and special skill it deserves a higher max level?
After the release of the new skill, Dungeoneering, I checked the skill guide as soon as I had logged on. And I got very surprised when I checked the milestones and item binding section. Check for yourselves:
What does this mean, do you think? What do "True skill mastery" mean? Are we going to get a new maximum level?
I ask you, the community, since I myself have no answer. I don't think this is a bug though, since both the maximum levels are 120, and not a random number.
This seems quite seriously done to me and I think that it is possible that Jagex have revealed something by mistake here.