India will most likey be involved ONLY in training and educational role in Afg. I seriously doubt the US/NATO would allow any further b/c they know Indian govern't has an ill intent in the region as it dreams of becoming another super power, a dominant world power, but the US/NATO are attempting to confine India's power ambitions to the South Asian region, not the world, and that too subservient to their interests.
And what does that "training and educational role" entail? That entails they will bring their books and experience with them to the table, they will teach their version of sub-continental history and philosophy, not to mention their military tactics and experience, all of them contain strong anti-Pakistan elements to it. And the innocent poor and illiterate afghans would simply consume it. They will train afghans psychologically against the Afghan Pashtoon groups and Pakistan, just like they trained the Mukti-Bahini rebels in Bangladesh. I also suspect a bollywood invasion, too in Afghanistan.
India doesn't have the will or guts to deploy soldiers, they'll be confined to petty construction and educational jobs. The good thing is that in this info-age, things are no-longer hidden, they'll be training only the dari/tajic/uzbek elements and largely ignoring pashtoon belts. lets see how successful they become in their aspirations. Afghan history is a testimony against all foreign attempts to control Afghanistan. Will they surpass all the odds and accomplish their goals? Highly doubt it.