The pilot Unknown Language Round #1 will take place soon (Monday, 21 February). It will be the usual ACM-ICPC unrated contest. The only feature - you will be able to submit problems using the only one, not very popular language. What? It's a secret!
UPD: The language annoncement will be available about 5 minutes before the contest.
The contest language is Tcl. Tcl (originally from "Tool Command Language", but conventionally rendered as "Tcl" rather than "TCL"; pronounced as "tickle" or "tee-see-ell") is a scripting language created by John Ousterhout (from Wikipedia article). Here is the sample program which reads and writes a single integer number:
set line [gets stdin]<br> scan $line "%d" n<br> puts $nYou may use "Custom Test" feature (see contest user interface) to run your programs.
UPD: The contest is over: final standings link. Do you like the contest?