Will the new recordkeeper affect our ability as retirees to count some or all of the retirement income as non-taxable housing allowance?

No, clergy will not lose their ability in retirement to count some or all of their retirement income as non-taxable housing allowance as they have done with TIAA. 

Although we are changing recordkeepers, the Plan will remain the same. The Unitarian Universalist Organizations Retirement Plan (UUORP) is, and will remain, an IRS qualified 401(a)/401(k) defined contribution, multiple employer, church retirement plan.