Wikia Staff have been developing a new VisualEditor for several months now, and until recently it has been optional feature which the local admins of each wiki could choose whether to enable.
I approve of the concept in principle, but after testing it, I made the determination that it was not yet mature enough to enable on this wiki. (See below for an explanation.)
Wikia Staff have now soft-enabled the new VisualEditor on all wikis - you can set it in your preferences, or choose it from the edit drop-down menu. As soon as this happened, I made a test edit - it erased a section. I immediately reported this and asked for the feature to be disabled until it was finished, but it is still enabled. They did not tell me "no", they just thanked me for reporting the bug.
I do not support the premature activation of this feature, and encourage people to avoid using it. Fortunately, no-one is being forced to use it yet, but eventually, it will replace the current "Visual" editor. Hopefully they will finish testing it by then.
I will not be doing any further testing of the new VisualEditor. As it is a central Wikia feature, I am required to ensure that the custom site style does not interfere with it, so I have already fixed one display problem. If you notice a problem which you believe is due to the site style, please report it to me and I will fix it, if applicable.
If you choose to use the new VisualEditor, always preview your changes before submitting them. VisualEditor edits in Special:Recentchanges are marked, I'll be sure to check those especially, and revert any edits which break things.
The reason why I do not want to adopt this feature prematurely is due to past experiences with enabling optional features.
I regret enabling Message Wall, because it still has outstanding problems which I reported over 2 years ago. If I had known these bugs were not going to be fixed, I would have disabled it as soon as I discovered the problems. It is still possible to disable it now, but doing so would effectively make the last 2 years of discussions inaccessible. So now, I disable features as soon as bugs are found.
The new Forum is not used on this wiki for this reason. It has taken Wikia Staff 16 months to fix one of the main issues I had with it, which proves that I made the right decision to disable it, and I will not enable it until the other issues are resolved.