As with 'momentarily', 'presently' can vary. I grew up thinking it meant 'in a little while' but then found that in Scotland it means 'at presemt', which is more logical.

I am told there is an area of Yorkshire where 'while' is used to mean 'until', which is not a big problem until someone comes to a railway crossing with a warning that that says 'DO NOT CROSS WHILE LIGHTS ARE FLASHING'.