It won't be done this update for sure, the current item they're working on is an Easy Building Creator, what you see in the list is always what's being voted on for the next feature to be added after the current one.
However, you may see some improvements in character AI where heights are concerned in the Easy Building Creator because there's a bit of an over lap of what is and isn't needed for the creator to work, the plan is to make an editor that can build quick and easy buildings and their interiors for those without modelling skills, part of this will be the ability to make multiple story buildings, from what I understand Lee wants bots to be able to navigate them properly, so he will probably be updating the AI to be able to navigate inside buildings built with the creator, so depending on what he changes we might get some improvements in the AI in general as a side effect.
i7, NV960 4GB, 16GB memory, 2x 4TB Hybrid, Win10.
i5 , AMD 6770 1GB, 8GB memory, 512GB Generic SATAIII + 2TB Seagate Baracuda SATAIII, Win7.
i3, Radeon integrated graphics, 4GB memory, 512gB Generic SATAII, Win8.1.
Q6600, Intel integrated graphics, 2GB memory, 180GB Generic SATAII, WinXP.