* Interim president, PM step down under pressure
* Talks over future leadership to be held later in Bangui
* No clear replacement, says French diplomatic source (Adds comment on possible replacements)
By Madjiasra Nako and Paul-Marin Ngoupana
N'DJAMENA/BANGUI, Jan 10 (Reuters) - Central African Republic's interim leaders caved in to international pressure and resigned on Friday after ...