If you're a student and you'd like to improve R by developing a new R package for 3 months over the summer — and get paid $5000 by Google in the process — why not apply for an R project in the Google Summer of Code? All you need to do browse the list of R projects available (if you have any questions about the projects, ask on the gsoc-r google group), and apply to GSOC 2014 using this template. The deadline for student applications is March 21, so act quickly. Students accepted into the program will be announced on April 21.
R Wiki: Google Summer of Code 2014