You can get mobs with this plugin: https://github.com/RevivalPMMP/PureEntitiesX Hunger is already implemented, you just have to set your difficulty I have no idea when Experience will be implemented. I think the main priority right now is getting ready for MCPE 1.0
Entities are due for scrap + rewrite at some stage in the future (shoghicp did actually plan to do this for PocketMine-MP 1.6 release, but things went a little pear-shaped since then). I'm planning to work on entities after MCPE 1.0 release, however the current priority is dimensions and various other 1.0-related things. XP will be implemented after that (need entities for XP ;P)