Ferrari might be gearing up to incorporate a 'double-DRS' setup aboard its improving F2012 car.
If true, the famous Italian team would be the first team to successfully emulate the controversial Mercedes system, which has been declared fully legal by the governing FIA.
Germany's Auto Motor und Sport said a new rear wing was among the very last upgrades to be trialled by Fernando Alonso as the Mugello test concluded late on Thursday.
"The wing has only minor changes. You have to look closely," read the report.
The magazine reported rumours that the wing might eventually accommodate the so-called 'double-DRS' or 2012-style F-duct, which would work in conjunction with a new and so far unseen front wing.
"That (wing) will debut along with a new diffuser and nose in Barcelona," added Auto Motor und Sport.
There were happy faces in the Ferrari garage on Thursday, as - despite a minor off by Alonso - the upgrades appeared to work well.
"Barcelona will be a key moment in the season, but not a decisive one," the Spanish driver insisted. "It's not a case that we will suddenly find ourselves back on pole position, because there is no magic button."
Echoing the earlier words of Mark Webber, Alonso said the "fastest car" at Mugello this week was the Lotus.
Red Bull's Dr Helmut Marko agrees: "It looks like Lotus are the quickest."
Veteran Swiss correspondent Roger Benoit wrote in Blick newspaper: "Lotus, with Kimi Raikkonen in super shape, is the championship dark horse."