OK, given the examples you've posted I'd follow up and insist his IEP is followed now, this year. The comments about "next year" are infuriating and not appropriate coming from his teachers, but you need to focus on having him receive the accommodations that are already in place for him. One thing that happened to us when accommodations weren't provided (that were in our ds' IEP)... we were then told *after the fact* that ds didn't need them because he'd coped without them. Plus it's just not right!
RE the teacher who commented that your ds couldn't have ti both ways - he's wrong, of course. Your ds *can* and should "have it both ways" - he's a gifted child who has been put into a gifted track program for next year, and he also has a disability and has been granted appropriate (and very typical) accommodations for his disability. We've had a teacher who tried to pull that on us too - some people honestly think you can't be intellecutually gifted and have a disability at the same time, or that it's some kind of choice to be either/or. In that situation, I'd summarize what the issue is in an email, include the comment from the teacher, and politely let the teacher know you're checking back in to be sure you understood what happened correctly - that gives him a chance to back down and say he didn't mean that. I think I might include that what your asking for isn't a "lighter work load" but a reduced number of problems, and then state (if this applies - I'm just offering it up because we run into this with our dysgraphic ds and homework) - 1) the reason for the reduced number of problems is the total amount of time it takes your ds to complete his homework due to the impact of his disability - state the actual amount of time, and that you suspect this is significantly longer than the teacher is requesting that the students spend on their homework, and 2) let the teacher know that your ds does not need the repetition to understand, learn and retain the concepts.
Gotta run - but fwiw, if you don't get a reasonable reply from the teacher, I'd rewrite all of it in an email to the teacher and cc the principal and the members of your ds' IEP team, and call an emergency IEP meeting to guarantee your ds is receiving his accommodations.
Good luck!
polarbear