Visio Viewer for iPad and Visio Online Preview has been released.
This will allow users to share and access diagrams from a web browser or iPad (iPhone app is coming soon).
It looks like you will be able to add realtime data into the online visio, allowing you to have a realtime map of your diagrams/networks.
You will need access to a Microsoft account or home/school Office 365 subscription.
For more details see the Microsoft link here.