It's a grand idea, but I don't think they'll get anywhere. Adamant Entertainment tried to get the license, but the ERB estate were non cooperative. It seems that they had bad experiences licensing Tarzan, and are unwilling to go through all the legal hassles.
As a result Adamant have bought out there own RPG, 'Mars', which is about as close to ERB's works as you could get without infringing any copyrights (though I have no doubt lawyers have perused it most carefully!). For example, Burrough's green martians have four arms, whilst the 'Mars' versions have only two. Otherwise they are very similar.