Hello and welcome.
- Is there any way to speak with NPC pilots ? I see many ships in space, but can i talk with them by radio and have some interactions ( escorte, trade, help, informations...) ?
You can open the trade console with them (once in range) to negotiate trades for items they may have or items you may have. You can also recruit them to join in your single player (offline) fleet. Also, you can ask them for information for hints or tips they may know, which can often come at a price.
- Is there anyway NPC / NPC interactions in the game ? As exemple, can i expect to see one day, 2 NPC factions figthing together ?
Some fight together, some against, some with you, some against you. In some systems, you may find ships from different factions fighting each other. Often a ship that is even affiliated with a faction you are allied with may attack you opportunistically. Ship affiliations do not always determine the threat to you, especially for civilian ships. Plus, keep in mind that each system has their own unique group reputations, so a Navy in one system may be hostile to you while a Navy in another is friendly. Some NPC ships may even come to your defense if your on a green threat level with them and you are being attacked by a red threat level ship.
- Do steam have the latest game version, where can i found my game version ?
Yes, in the main menu at the lower right corner (example: 'V2.728').