This claim will be judged TRUE if Microsoft releases an operating system with the name "Windows NT 5" (or similar spelling thereof), on or before December 31, 1999.
Background: The successor to Windows NT 4, called "Windows NT 5", has been in beta for a while. Its release date has been slipping by relatively large amounts; its codebase is rumoured to be in the range of 40 million lines of code, and Sun's CEO claimed that such a product was "unmanageable".
This claim is not about the capability of the system, which may or may not vary widely from current expectations, but about its name and release date.
Statement, 8-Dec-1998: Microsoft has announced that the next major release of Windows based on the NT kernel -- previously titled NT 5.0 -- will now be called "Windows 2000." If this is the case, the requirements of this claim for a YES judgemnt ("...system with the name 'Windows NT 5'") will probably not be met.
However, even in light of this information, I will not judge this claim in favor of NO claims until the judging date arrives. It is still possible, however unlikely, that MS will change its mind before the deadline for this claim expires.