"The most logical step forward is Formula Renault 3.5," he said. "Other than a Formula E car, I haven't driven any car other than a two-litre (Formula Renault), so I'm quite excited to see how it feels to drive something else.
"You hear so many driver comments about the bigger categories and how much more downforce they have, so it will be interesting and time will tell how I get on."
De Vries - who will take part in this week's post-season FR3.5 test at Jerez - added that while he has a close relationship with McLaren, the F1 team is careful to make sure it does not prove a distraction.
"They are really supportive, and I visit the factory on average once a month," he said.
"They don't interfere, they let me focus on what I'm doing. They just support me and are very interested in my progress."
By stepping up to FR3.5 de Vries also receives a contribution of €500,000 from Renault Sport towards his 2015 budget as part of his champion's prize.
TOUGH ACTS TO FOLLOW
De Vries is the sixth-consecutive Formula Renault Eurocup champion to graduate to FR3.5 the following year (the last driver not to make that step was Valtteri Bottas after winning the 2008 title).
Here's how his predecessors performed in their rookie FR3.5 campaign - setting the bar very high for the McLaren racer:
2014 Pierre Gasly Second in the championship
2013 Stoffel Vandoorne Second in the championship (4 wins)
2012 Robin Frijns Champion (3 wins)
2011 Kevin Korjus Sixth in the championship (3 wins)
The 2015 Formula Renault 3.5 season will be notable for being the last with the French company's backing but also produced a worthy champion in Oliver Rowland. PETER MILLS evaluates this year's crop of drivers
Last year's field was extraordinary and hard to match, but the Formula Renault 3.5 grid will still have plenty of talent this season. Glenn Freeman runs through the field ahead of this weekend's season opener
Landing the Fortec seat that took rising star Robin Frijns to the 2012 FR3.5 title was already a good sign for Stoffel Vandoorne. Then McLaren took him under its wing. Peter Mills tells Vandoorne's story so far