If its Linux only don't present it as a successor to TrueCrypt. A very important feature of TrueCrypt is(was) that it targets Linux, Mac OS X and MS Windows. Any archive being available to any of the three platforms.
I don't know about Mac support, but if Tomb is just a wrapper around LUKS, the volumes it creates should be accessible on Windows as long as you use a filesystem Windows knows about. Ext2IFS doesn't work on anything newer than Windows Vista, so you're most likely looking at FAT32, exFAT, or NTFS if you want your LUKS volume to be portable.
Assuming a suitable LUKS volume, you can mount it on Windows with LibreCrypt, which is the successor to FreeOTFE (by way of DoxBox). My work machine still has FreeOTFE on it, but I just installed LibreCrypt on Windows 10 at home and the encrypted volume on my flashstick mounted right up.