I'm not in the know but there is quite a lot of information in the article:
Generation 1 and Generation 2 will lift the payload capability from the Zephyr 8's 5kg to 20kg and then 40kg respectively, while also adding more power (the Gen 2 would have 1 kilowatt). This will open up heavier, more capable payloads, such as more sophisticated IR/EO sensors or advanced radars.
So: radar and IR/EO sensors.
And on the theme of radar:
Indeed, speaking at a pre-DSEI briefing, Steve Whitby, HAPS Business Development, at AirbusDS revealed that the hollow structure and its long 35m wingspan would open up possibilities of fitting phased array radar modules to turn the drone into a giant radar antenna. This could conceivably provide an unmanned AWACS-type platform equipped with a sensitive radar the capability to detect stealth and LO aircraft, missiles or drones. Networking two such AESA-equipped drones together would provide an even more capable counter-stealth capability.
For the sake of it I looked up a Surrey University concept for producing a 150kg SAR satellite of which the bus is about 100kg and the SAR payload 50. Doesn't mean a huge amount obviously:
https://www.google.com.tr/url?sa=t&r...02537793,d.bGQ