I sent an email to the retail store GAME about the version I would be getting with my preorder and just got the following reply:-
So hopefully I will be getting the SP/MP, but they don't seem to know much about it and also still saying November, though the ad on their website is now TBC.
Dear Sir/Madam,
Thank you for your email. Half life 2 will only have one version released with both single and multiplayer included in it. The release date has changed to November sometime.
If you have any further queries please do not hesitate to contact me again. Alternatively please call 0800 317 778.
Regards,
Ian Mason
Customer Services Assistant
Game Stores Group LTD
So hopefully I will be getting the SP/MP, but they don't seem to know much about it and also still saying November, though the ad on their website is now TBC.