personally I'd like the next update to be something like able to sell or switch out the girls in some manner... being stuck with your starting girls sucks.... >_< especially so if your starting girl is not to your liking. >_>
after that I'd say focus on the stat features, events that effect them, and things that you can do to improve them. ;P and of course toss in some bug improvement in-between.
oh-and event that improve the girls currently untouchable stats like beauty, skill, ect, ought to be more common... like every 3rd day or once a week.
but this is of much lower priority if you ask me. :p
some bugs include:
the brothel's bar income (as mentioned above by footlover)
working at the bar in the city doesn't work the majority of the time either.... idk why either... >_> I paid the owner to work their at the secretary's office and already had the streets opened to 1 level above the bar... >_>
mood of the girls doesn't appear to change despite the daily reports... (I think you have yet put that in so I don't think it's a bug... but I could be wrong...)
but I'd say the most annoying bug is the black bar that blocks the left side of the screen... it happens when you try to do something your unable to like if you try to buy something without the money or have a girl work in the city when their in jail and click anywhere except the [X] that close the invalid command box box... (again as mentioned by footlover above)