Button and team mate Sergio Perez took the wraps off of the MP4-28 this morning.
"I’m going into my fourth season as a Vodafone McLaren Mercedes driver and, more than ever, I know and understand the strengths and abilities of this team. This year is really about continuity and consolidation," he said.
"Obviously, the biggest change for 2013 is my new team-mate, Checo. It’s always interesting and inspiring to begin working with a new face, and it already feels like a very positive working relationship."
Button acknowledged that McLaren had a strong 2012 but fell short when it mattered.
"We were extremely strong throughout the whole of the 2012 season, but, for one reason or another, we couldn’t quite pull it all together to challenge for the championships. That’s something we want to address for 2013. I’ve seen just how closely everybody has been working together on this car, and I think we’ve got the basis for a very strong season."
"We’ll be working extremely hard during the pre-season to ensure we go to the first race with bulletproof reliability. Operationally, too, I think we’ve learned and developed from last year, and that will help us run a much smoother and stronger campaign."
"This year’s car is the best we’ve ever made – I know the engineers have left absolutely no stone unturned in wringing every ounce of performance from every available area. I cannot wait to get behind the wheel and attempt to carry forward the incredible legacy that lives beneath the skin of every single man and woman who works at McLaren."