RB 4011 is fanless?
Can I use it on towers during summer?

Yes, it is fanless, but it's not an outdoor device, it is not waterproof.

Are we likely to get a (proper) rackmount model, similar to 3011? Or will only the desktop model with big ugly ears remain? The 3011's are a really nice presentable case to put in a customers rack.

not in near future. there are other devices that have rack cases

not in near future. there are other devices that have rack cases

If I could get an 1100 with an SFP/SFP+ port I'd be happy haha, was thinking of the 4011 to start replacing our 1100AHx4 fleet if it came in a respectable case (With dual power)

You need proper rack, proper router and SFP+, and fitted inside a rack, it means you no longer need to look in the "Home" device section.
Here is a proper device for you: https://mikrotik.com/product/CCR1009-7G-1C-1Splus

You'd call RB1100AHx4 a Home router? But in any case I can appreciate that, for us though the ~60% price difference from RB1100AHx4 to CCR1009 isnt justified by our want for SFP+ port (at this time), this is why i was thinking 4011 could be a good middle-ground if it came in a comparable configuration to RB1100 (ie. rackmount and dual power), but not everyone can be satisfied otherwise you'd have too many SKU's!