Both are fine. Here are my ideas:
WILL be (do)ing (‘Future Progressive').
The modal WILL followed by the durative(progressive) infinitive be ....-ing can have two possible overtones, both stemming from the combination of the ideas of certainty (WILL) and limited duration (progressive form).
The first possibility is that the speaker is describing a situation already begun, having duration, and not completed by the time mentioned or implied. This would be explicit in:
At 5 o’clock tomorrow George will be driving down the M1.
This would cover your second sentence.
The second possibility is that the speaker is more concerned with the pure certainty of the action happening than any volitional aspect that might be implied by the use of WILL by itself.
I’ll be seeing Mary tomorrow. I'll ask her about the arrangements then.
It is claimed by some writers, with some justification, that the use of WILL be....-ing implies, by its lack of reference to intention, volition or arrangement, a 'casual' future.
This covers your first sentence.
Depending on the context and co-text, the speaker may be intending a ‘casual’ futurity, or may be indicating a situation in progress at a particular time.
From: Ways of Expressing the Future in English
- For Teachers