Is the book gonna mention Indies and such like implode, atlantean, mysterious fish and stuffs like that?
That depends on what people contribute.
Basically, my view of the book is quite casual - almost like a series of printed forum posts where people can say what they like, as long as it relates to the PCE. I'd like the focus to be on personal writings or creations, so although there is room for 'A History of <something>' I think it would be nice if the bulk of it consists of personal stories, feelings about the system and games etc.
But I'm not going to try to steer this too much in any direction. Think of it as something we are all making as a tribute to the PC Engine. I'm just here to edit it and slap it all together.