Yes it will return - maybe some other flavors too.
There are two reasons for the delay:
a) I want to fully test DarkRoyale with regards to RoK/LU40 - many, many changes were made and I did a LOT of last minute updates. I'd play for a while... oops, that doesn't work right... fix.... play a little while (rinse, repeat) heh
b) I decided to turn some of the text to non-colors (grey or white), leaving emphasis text colored. I documented which colors are being used and it should be easy for me to globally change all the necessary colors to get the DarkSoul look. Really, there's not a lot of noticable difference from Darkroyale and Darkroyale with grey text in bits. Then I just have to slip in the graphical changes and .... in a nutshell it's easier to keep up with multiple themes this way.
So heck, if I wanted to release a holiday theme it would just be some changes here and there (using a multi-document clever search and replace) and ... Merry Christmas
Really, I am more of DarkSoul fan too (though I like them both). I'd like to also do a Black and White theme and maybe a green one (more of a mint to kelly green) and... hot pink anyone?
It won't be too much longer.