Ha Long – Mong Cai Railway, Malaysia keen on resuming high-speed rail project with Singapore, Bataan-Cavite Interlink Bridge to start in late 2023, first phase of Bangkok - Chiang Mai rail project
Notably the road into Siem Reap center from the new airport, Highway 6, apparently isn’t being upgraded and will likely be a choke point with increased traffic.
More big resorts being built out that way. The resorts built close to the old airport are likely really happy, with additional transit time, though less noise I guess.
Traffic will be as pleasant as coming into the city from Phnom Penh airport. Great that they discontinued the PP airport train service, which was admittedly close to unusable.