Existing Unrealscript Project

Is there any impediment to continuing to work with UDK3 for a while?

I haven’t started any project yet, but I plan to do so soon and I have made ​​the 75% of the code for that project.

I’ve been watching UE4 and I think giving a great graphic jump, but it seems somewhat slow for current machines.

My question is if to delay my project 8 or 12 months while I learn EU4 or finish it with UDK3, an after go for UE4.