will be ING and past progressive

[Guzhao67]

Hello; the following text was taken from a grammar book, and i can't see the point the author wanted to convey.

"Other uses of the progressive aspect
It may be used especially following the auxiliary will or shall with the special implication that the action will take place 'as a matter of course' in the future:
I'll be seeing you next week.
Note: 'The 'matter-of-course' implication of will or shall with the progressive is also found with other modal auxiliaries, and possibly also with the past progressive in conversational contexts; eg: I was talking to Anne, and she was telling me that the job is still vacant. In contrast to the simple past talked and told, the progressive here suggests a casual chat rather than a purposeful discussion."

My question is: what's the "matter of course" implication in ' I was talking to Anne, and she was telling me ..."; and why ING form is more conversational in contrast to simple form? I can't see any link between "will be ING" and past progressive. could you help me? thank you.

[Mister Micawber]

'Matter of course' means that the action described is not remarkable or unusual. -Ing is more conversational because, in stressing the durational aspect, shows increased interest on the part of the speaker. There is no strong link between future and past progressive in the way they are interpreted. Past progressive usually serves as a background action to another past action of short duration.
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Native English teacher at Mister Micawber's