Brazil Presidential and Congressional Elections 2018

[sb95]

Maybe this isn't the correct thread, but I didn't find a thread about brazilian politics in general. After the last labour reform, I read in some media in my country, that the current government is analyzing an electoral reform that would change the way the representatives would be elected, and the financing of political parties.
The article I read refers to the possibility and support of PSDB and some right-wing parties for a transition to a parliamentary system (is any general consensus about this in brazilian politics/society?) and the change from the current system (i think it's PR party-list) to a single non-transferable vote (SNTV) that it's only used according to the article in Afghanistan and Jordan and it's opposed by the majority of the academia. They also propose to eliminate re-election for executive mandates (president, governors, mayors), an increase of it from 4 years to 5 years and the end of compulsatory voting.
Is any of this reforms really taking place or it's just speculation?

[sb95]

Well, since each day the election is getting close, I'm reviving this.

There have been some recent news about Luciano Huck, a television host for a program called "Caldeirão do Huck" (Huck's Cauldron in english) thinking about a possible campaign for president next year, I saw many websites claiming that he's party would likely be the Popular Socialist Party...

Knowing the average Brazilian, I wouldn't actually underestimate he's chances of winning if he runs.

Dr. Rey from "Dr. 90210" has said he's going to probably run, and he actually seems kinds serious about this, I saw somewhere that he wants to resurrect PRONA, that was a former Brazilian party, the party was known mostly because of Eneas Carneiro, who ran for president some times and got almost 8% of the vote in 1994. From one interview a saw, he seems to want an free market economy and at the same time, he seems to have a pretty nationalist rhetoric, Rey is currently in PEN, which is the party that Bolsonaro seeks to join, so in case he doesn't create the new PRONA and wants to run, it might be tough.

Rey actually already ran one time to be a congressman, but he lost.

who are the candidates of the other major parties or coalitions? does parties only work as a structure of a political figure only? does PR, Progresistas (who are centre-right?) support Bolsonaro?