Zac & Vanessa - is this rumour true?

I read recently that Zac Efron has proposed to gf Vanessa Hudgens while they were on holiday in Japan in late January 2009 and that they plan on having a long engagement and marry in 2010. Has anyone else heard this and maybe have any links to an interview with them confirming it or is it just a rumour? If it's true, whic i hope it is, then i'm really happy for them as they make such a great couple and i wish them all the luck and happiness in the world. Thanks, Lisa Michelle x x lol x x