The calender/plan:
The following is simply an outline of what could be, and it will be updated (probably even during the travels!!!).
April:
19.: 14:55-04:10 Troels + Lars Erik fly to Teheran (BMI via London).
20.: 17:25-04:10 Mikkel + Christian Fly to Teheran (Turkish via Istanbul).
21.: 04:10 Arrival Teheran. See Teheran (shortly). 17:30 Train to Mashhad.
22.: 07:40 Arrival Mashhad. See Mashhad.
23.: See Mashhad.
24.: 6:00 Depart for Turkmenistan (227km, 2:53h). See Ashgabat market.
25.: See Ashgabat (Nissa, etc.).
26.: Drive to Mary (362km, 4:40h). See remains of Merv.
27.: Drive across desert to Bukhara (386km, 5:24h). See Bukhara.
28.: See Bukhara.
29.: 8:05-11:10 Train to Samarkand.
30.: See Samarkand (and possibly Shahrisabz).

May:
1.: See Samarkand. 00:49-05:55 Night train to Tashkent (not definitive!).
2.: See Tashkent.
3.: Drive through Fergana Valley to Osh (405km, 5:27h).
4.: See Osh. Drive to Sary Tash (170km, 2:29h) and stay in yurts (?).
5.: Drive to Kashgar (about 300km, 6h incl. passing border).
6.: See Kashgar Chr. Hededal arrives 17:00.
7.: See Kashgar and/or drive up Karakorum Highway?
8.: Kashgar Sunday market. 13:16 Leave on K9788/K9785 train to Turpan.
9.: 11:41 Arrive in Turpan. See Turpan (Bezeklik Thousand Buddha Caves). Depart 23:15.
10.: Arrive 9:24am in Liuyuan (Dunhuang). See Oasis with Crescent Lake and Mogao Caves.
11.: 10:15-12:35 Fly to Xian (China Southern Air). See Xian.
12.: See Xian (Terracotta Army, City Walls, etc.).
13.: See Xian. Depart for Beijing (20:16-07:17).
14.: 07:17 Arrive Beijing. Party in Beijing :-) 02:00 Fly to Cph (via Moscow).
15.: 11:25 Arrive in Copenhagen.