It's been a long time now, that it has been reported that a fourth Mummy films was about to be made. However, since I didn't read anything new about it.
I wonder if they are really planning to make one, or if this pseudo-announcement was an attempt to test at the audience's interest in a new film.
Personally, I am not sure if I would like a fourth film. The third left me a bit disappointed, and was going to far from the roots of the series.
May be they should move on with a new franchise, or back to the roots.