If you thought this past season of F1 was at times confusing apparently from the debate i've participated in on the autosport forums, this season could be worse.
Now recently the rule to engines was, it must last 3 races. However now the the FIA official rulebook states the teams will be allowed 8 engines for the season, after that any subsequent engine change will result in a 10 place grid penalty and they will be allocated 4 engines for testing.
The Parc Ferme rules are also changed apparently with teams being allowed to make changes for upto 3 hours I believe after qualifying.
Now on the first one.
This could technically mean that teams may try to stretch an engine more than 3 races to save some for the end of the season race for the title where a fresh engine might be advantageous.
It's going to get very confusing keeping up with it all I think and I believe there are further stupid changes.