Oh I'm sure we'll see such things in BFE in the future. As releases go on, they'll have to go a bit farther and farther into the future for each release.
What's interesting to think about are the point costs for such units. As things move up in cost and effectiveness, we may see things like different periods of the war, starting with Wave 1 through *, being of the early period.
Also we won't see powersuits in BFE, but we may see simple load bearing exoskeletons for some units. Say maybe advanced combat engineers and such.