Bjp had broken the norm of the most senior parliamentarian being the pro-tem speaker.
Kodikunnil Suresh, Congress' MP from the Mavelikkara assembly of Kerala, was the seniormost MP(8 terms, 25+ years of experience as an MP), but he was not made the pro-tem speaker.

Another norm that the ruling and opposition sides come to a consensus such that the deputy speaker post is given to someone outside of the ruling party, while the speaker is chosen by the ruling party is also being challenged by the Bjp.

So we're seeing election for the post of Lok Sabha speaker as a first.