FYI, we contacted BSI and below is their response as of yesterday afternoon (1/11/2018). Of course, the new tables are just a part of the required payroll system changes since the W-4 process also needs to be updated to accommodate the new law. We will post any additional information from SAP or BSI on these changes as we receive it.
"Hi Jeff, We are aware of the new tables being released by the IRS and are actively working on getting these updates released. The updates for Federal Withholding have been targeted to be included in bulletin 128, which will be released in January."