Retina iMac Reference Found in OS X Yosemite
Sometimes Apple gets a little excited about new computers and creates files for them in OS X before they are even released. Apple has, again, messed up and included a reference for a screen resolution of a computer that does not exist yet.
The first of these resolutions indicates hexa "00001900 00000e10" is therefore a resolution scaling of ... 6400 x 3600 (probably 3200x1800 HiDPI).
Continues and is 5760x3240 (2880x1620 HiDPI) 4096x2304 (2048x1152 HiDPI), etc..
(There are other resolutions, just make the conversion from hex)
With this alone, it is not possible to guess the native resolution of the machine. This is a resolution that does not appear in the file, since it is native and does not have to be "scaled".
Knowing that there is a gap between the values of 5760 and 4096, one can imagine something between these two (probably 5120x2880, 2560x1440 or in HiDPI), but this is speculation.
A few weeks ago when Apple seeded OS X 10.9.4 and then pulled it a few hours after. Within that there was three new iMac files. Now, these new files are just another hint that new iMacs are coming.