Well, exclusive news to those following these forums, I'll let you in on some nice little editor updates we've implemented for those of you who will be modding.
So far you already have (since the 2013/4 updates)
* Marquee select now works in the front and side viewports
* Space bar will now maximize the viewport you are working in (even if they are fixed)
* Added filters for the sound and static mesh browser windows
And rolling out in the Workshop update you have:
Better editor icons, it's now much easier to read the maps just by looking at them, ie:
Many actors used to share the same icons so this should help quite a bit.
*You can now navigate the viewports with WADS much like you can in Hammer or UDK
*You can now change the drawscale of the actors from the bottom of the main editor window (like in UT03/04 editors)
*Added an easier way to reach common actor classes https://www.dropbox.com/s/alvgczv8dpnhmzb/weapondropdown.png
*Some fixes, like for example sometimes a actor would not place due to collision problems, we've fixed that so they should always place where you want.
EDIT: Oh nearly forgot this little gem, - and = are now hotkeys to change the grid size, which is way handy.