#1 -- For a promise to inform about a meeting that has not yet taken place: I'll let you know what we discuss at the meeting. (#2 & #3 imply that the meeting has already taken place. #4 suggests that you know now what you will discuss.
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Anonymous-
1"I'll let you know what we discuss at the meeting."
2"I'll let you know what we have discussed at the meeting."
3"I'll let you know what we discussed at the meeting."
4"I'll let you know what we will discuss at the meeting."
I'd like to say one of the phrases above to a person who is going to be absent from the meeting before the meet