Iskren and Iliya are replaced by voice overs (Giulia and Masha respectively).

These are the voices in their heads that tell them what to do anyways.  

The show discusses the feedback that Life Math Podcast received in its first season and promises to address it:

• Better voices (thus the voiceover thing)
• New people (guests on the show)
• Shorter episodes

That is also what you should expect in the future!

Have fun!