Yes, mod support and private servers are going to be a requirement for Tribes. Optimized for super large maps and large player volume per match are genuinely secondary to how important Mod Support (and thus Private Servers) was to the originals.
Otherwise its just another cash grab copying someone elses homework.
I got here because the Google machine couldnt answer if there has been any info on Mod Support. Guess I will have to wait a while, but given the Developers history, or rather the lack of connection to the originals, I have no positive expectations.