The simple version of the allegations is that Ferrari are allowed to run 120kW of power from their ERS but some folks think they have managed a way to deliver more than that during a race.
The FIA have a sensor in place that measures the amount of electric output from the ERS and while they inspected Ferrari’s system in both Azerbaijan and Spain, they have installed a second sensor in Monaco just to be sure. In those initial inspections, the FIA were happy with what they found but the allegations are that Ferrari have a special software that delivers more power and thus the additional hardware to measure it this weekend.
Ferrari say that’s perfectly fine with them as they are not doing anything wrong and both Mercedes and Red Bull bosses, Toto Wolff and Christian Horner respectively, are fine and have full confidence in the FIA to ferret out any contravention of the regulations.
The FIA and Formula 1 have asked Pirelli to ditch the multiple names for all of their compounds in 2019. Names such as Hypersoft, Ultrasoft, Supersoft would go away. The differing compounds would all remain but the new names would simply be Hard, Medium and Soft. Which compound Pirelli would bring for those three categories would be determined per the track.
If Pirelli chose to bring the Supersoft, Ultrasoft and Hypersoft compounds to a track, they would be Hard, Medium and soft respectively.