I always thought this might happen. The Russian broadcaster has announced that "due to high interest" the submission deadline has been extended until 28th February, with the grand final being held sometime in March.
The original date for the Russian national final was 31st December. Rumours have it that there are many big names interested in entering the Russian final... Hmm! That's interesting. Anyways, we won't find out for sometime! The new date of the national final is to be decided.