Don't lose your hope. There were people who were informed about the interview until mid February in previous years. For example,
user name = tudor (applied for MSc in Physics)
Informed about interview: 9 Feb
Skype interview: 11 Feb
Official offer, e-mail: 24 Feb
Official offer, snail mail to Romania: 2 March (no word about ESOP)
ESOP decision: ? waiting
user name = jmlribeiro (applied for MSc in Computer Science)
Informed about interview: 9 Feb
Phone interview: 11 Feb
Official offer, e-mail: 17 Feb
Official offer, snail mail to Portugal: 19 Feb (no word about ESOP)
ESOP decision: ? waiting
user name = camilo.z (applied for MSc in Physics)
Informed about interview: 11 Feb
Phone interview: 13 Feb
Official offer, e-mail: 24 Feb
Official offer, snail mail to Colombia: Waiting
ESOP decision: ? Waiting
You can read their answers in ETH ESOP 2015 thread.