The teams say they’ll launch their own series from 2008 but FIA president Max Moseley has invited them to a meeting in Paris next week to discuss technical regulations for F1 from that year.
So in the latest chapter of the F1 saga, the teams must decide whether they’ll attend.
At today’s meeting the nine teams - all except champions Ferrari, - and five manufacturers meet in London to add more flesh to the bones of their plans.
"It will be all about moving further forward with the four working groups, taking the 2008 regulations to the next stage and laying down a proper road map of times and dates and objectives," Minardi boss Paul Stoddart told Reuters.
McLaren's Ron Dennis added: "If the decision was not to attend, that's not out of disrespect for the FIA or a lack of desire to find a way forward.
"It's more likely to be linked to the fact that we'd like to have a clear understanding of what we want and we're not there yet. People should remember that what we're talking about is the post-2007 position.
The manufacturers alliance of BMW, Renault, DaimlerChrysler, Honda and Toyota, want most of the revenues, a level playing field and far greater transparency.
At the moment most of the money goes to Formula One supremo Bernie Ecclestone's holding company SLEC, now controlled by three banks.
