Italian Elections and Politics 2018: Yellow Tide

[YL]

It's official: PdL is gonna split.

Oh my God. Details?

http://www.bbc.co.uk/news/world-europe-24966934

[YL]

Last December, the Constitutional Court struck down the majority bonus that was allotted under the previous electoral law. This effectively turned the electoral system in both houses into fullscale PR. While stripping the Senate of its confidence and supply powers would indeed have been sufficient under the previous system, now that alone would achieve little.

Are they removing the confidence and supply powers from the Senate?  And if not, what's the proposed electoral system for the Senate?

[YL]

What exactly is going on with Venetia?

An unofficial online "referendum" organised by a separatist group.

[YL]

I never thought I would say this, but maybe they should just use FPTP.

Has anyone actually tried modelling what Italian elections might look like using FPTP (or AV, or the French system)?  Would M5S get squeezed out?