Interested in Language
1. Will I be able to discuss it with him?
2. Shall I be able to discuss it with him?
What's the slight difference in meaning ?
Yes, you will (I think you will, my advice is that you discuss it with him)
Yes, you shall (It's set, I'm only informing you)
Thanks in advance.
I agree with Bhaisahab that the meaning would generally be the same in BrE. It could be argued that will could be used when asking for authorisation from the person who could give it and shall when checking with someone who didn't give the authorisation, but few BrE speakers still use shall regularly enough for it to be clear and it's hardly ever used in AmE. South Asian speakers, where I believe it is more used, might feel differently, though.
Traditionally, here is the run-down of shall and will:
I, we shall
he, she will
I, we will
he, she shall
So, shall belongs to the first person, will to the others..... unless you want to emphasize, then they are reversed.
When reading academic texts we still see this all the time.
In modern spoken English, "will" has all but taken over for all persons.