From Chicago Business Language on a long-expected proposal to bring widespread Internet gambling to Illinois finally has surfaced in Springfield, and by all indications the plan will be both highly lucrative and highly controversial. The language was circulated late Tuesday, according to my source, by aides to Senate President John Cullerton, who long has said he wants to legalize online gambling because of the potential payoff in state revenue but has separated the issue from the proposed expansion of casino gambling. Mr. Cullerton’s office didn’t officially confirm that something is coming. But his spokesman promised “details to come” — and…