Putting this here as a suggestion.
It'd be really nice if links working inside the Pages App widgets (either links inside WYSIWYG blocks, Upload Image blocks, etc.) had the option to open in a new tab. That seems like a pretty basic option that would make life so much easier. Perhaps this could be a feature in coming versions/updates?
Thanks!

Are you referring to links to other sites? If so, this is already a site wide option in System>Settings>Posting

I already have that option selected, but that does not make a link in an "Upload Images" block (via Pages App) open to a new window. 

1. Go to Pages -> (Page Management) Blocks in your ACP
2. Click 'Create New Block'
3. Select 'Page Builder: Upload Images'
4. Click 'Next'
5. Fill out whatever you want on the 'Details' tab (only really needs a name)
6. On the Content tab, do the following:
   •  Change the 'Use this template as-is' entry to 'Use as a base for a custom template'
   • Change this:

   • <a href="{$urls[0]}">

   • To this:

   • <a target="_blank" href="{$urls[0]}">

7. Click 'Save'
8. On the front-end, drag that block in place and fill your boots.

Thank you SO, SO much!!