This has been on Trains magazine website for awhile and just made the May issue. I think it's been mentioned here before but a group called the T1 Trust plans to build a replica of a Pennsy T1 4-4-4-4 steamer. There's a question and answer with the head of the T1 Trust chairman Brad Noble in the Preservation section of Trains.
They claim to be able to have the money raised and the building of the engine completed by 2030(only fifthteen years).
They also claim to have solutions to the wheel slippage issue the T1 had plus they claim to have a foundry that is capable of casting the frame in Atchison Kansas.
Lofty goals in my opinion, I wish them the best of luck. More info can be found here.