The 1st video seems like an expansion on the reactive-armor concept. I don't see how it is supperior to the current reactive-armor systems. It does not eliminate the primary negative, that is friendly troops can be killed by their own armor if they dismount the vehicle.
The 2nd video, last I checked the new all-electric cruisers are still in the field-testing phase until 2018, but have been meeting or exceeding expectations thus far.... I may have to research this again it has been a while. The bigger issue here is about 70% of the current fleet could not be retrofitted with rail-guns without diminishing (replacing) some of their current systems.