Wait for it, it's coming soon™
A bit more detail: the protocol used for communicating breakpoint and run information can also be used to communicate variable values. The program being debugged already contains some foundational work for variable inspection, the hard part is the IDE side of things.
When you consider all the different kinds of variables you can have (numeric, string, arrays, TYPEs, arrays of TYPEs etc) you can imagine how it can be non-trivial to get the user interface right for it.
But rest assured, such a feature is planned.