Yes, with the adoption of the NATO STANAG 4774 and 4778 standards we will reach a position where the data of all nations is protected using the same metadata standards, therefore, allowing for far easier sharing of protected data. Currently, each nation (or in some cases each system) adopts a local classification format, the data becomes over classified to match the network classification and guard products become more complicated having to support a multitude of formats and rules.
This results in unclassified data becoming secret, requiring a time-consuming review process and change of classification before the information can be shared, by which time the moment may has passed. In todays environment a multi-nation coalition force should easily be able to share data!