The Source
Nothing had been decided yet!
However I dont care that much to be honest since I was rooting for a Glory tour in 2017 but it would not happen since she is doing Vegas for a 4th year (Already comfirmed) so is she do a 2018 Im ok since I dont think she would release a new album until then so I prefer Britney to keep doing Vegas instead of nothing!
Also we had been this year that she is perfoming outside Planet Hollywood! She did arround 5 festivals this year even one in London! so maybe she could do More in 2017 or maybe some Europe/ Australia tour Legs Anything could happen!