I too feel (at least initially), they will push for high speed + high FUP (or unlimited plans) to stand out when compared to the rest of providers.
If they launch too many plans at first, people will be comparing each and every aspect of the plan and this will lead to leverage for other providers to compete at multiple price-points. Instead, they will (should) launch only 3-4 plans at least initially.
Unlimited/No FUP is possible in 2019 really,
1. Most of the usage these days is "peered" (ie, free of any data usage costs), most of the cost is in infra only, Usage like
Netflix, PrimeVideo,
Windows updates etc ie, 90-95% of "heavy" usage is almost all via peering, this leaves say torrents, which if seeding peers are in the same ISP, again becomes "internal" usage.
2. Compared to the past where there wasn't much peering in the country/not many peering "points", now at least all major cities/metros have some sort of peering exchange (see Fast.com, for netflix local peering points -- I think).
3. Hathway has been offering no FUP plans for a bit in Hyderabad, but on other hand, Airtel too in Hyderabad has been, maybe they are gathering data usage patterns to optimize network/peer further ? (Hathway is owned by Jio in some %).
4. Offering cheaper/more data/speed in wired/FTTH, will overall help Jio by lowering loads off towers at least in urban areas where people may have been using Jio 4G as hotspot etc. Lower load on tower will lead to overall positive experience of all Jio services. Which imo should be the target by launching FTTH.