I hope Logos 4.0 has tablet/touchscreen pcs in mind.  I use my asus 1000h netbook (with touchscreen) with logos during sermons and bible studies.  I rotate the screen 90 degrees and hold it as if it were an open book.  The 1024x600 screen is actually nice in portrait mode when using Logos.  I just wish it were easier to manipulate the text and navigate using a stylus or finger.  
Adobe acrobat has a full screen mode in which I can read texts in portrait mode and drag the text around and navigate using a finger.  I would like to see a full screen mode in Logos 4.0 that is even better to navigate with a touchscreen.  If there were a touchscreen mode with easy to manipulate navigation buttons I'd be recommending it to my friends with touchscreen netbooks.