http://www.sternpinball.com/downloads/MTL105.zip

1.03 was : 69,655,538 bytes
1.05 is : 70,403,689 bytes

Music track info and Feature Adjustment info below!
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Music Track List :
1. Battery
2. Creeping Death
3. Enter Sandman
4. Fade to black
5. For whom the bell tolls.
6. Fuel
7. Master of puppets
8. One
9. Sad but true
10. Seek and destroy
11. The end of the line
12. The unforgiven

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Here is a list of some of the FEATURE adjustments in Metallica 1.05 for those who might be interested, with factory default in brackets.

1. Adult Content (yes)
2. Insult Level (high)
3. Song Select Lock / Plunge (yes)
4. Mystery Difficulty (medium)
5. Grave marker starting hits (2)
6. Grave marker additional hits (1)
7. Electric chair starting hits (10)
8. Electric chair additional hits (3)
9. Snake starting letters (0)
10. Snake Additional letters (-1)
11. Snake start. shots lit (3)
12. Snake start. shots for snake lit (1)
13. Snake addl. shots for snake lit (1)
14. Shot features carryover ball/ball (no)
15. Shot features reset w/ part. lit (no)
16. 1st captive ball e.b. (auto)
17. 2nd captive ball e.b. every (100)
18. 1st combo extra ball (25)
19. 2nd+ combo extra ball every (100)
20. Combo jackpot lit every (20)
21. 2X scoring timer (20)
22. Band member start. tgt. compl. (2)
23. Band member addl. tgt. compl. (1)
24. Coffin lock lit tgt. compl. (3)
25. Starting fuel level (2)
26. Additional fuel level (-1)
27. Fuel mode timer (40)
28. One mode timer (40)
29. Coffin M.B. autofire timer (20 seconds)
30. Cross M.B. autofire timer (10 seconds)
31. Grave marker M.B. starting shots (5)
32. Grave marker M.B. addl. hits (1)
33. Elec. chair M.B. autofire timer (15 seconds)
34. Snake M.B. autofire timer (20 seconds)
35. E.o.L. starting Grave Markers (50)
36. E.o.L. additional grave markers (10)
37. E.o.L. starting electric chairs (50)
38. E.o.L. additional electric chairs (10)
39. E.o.L. starting coffins (50)
40. E.o.L. additional coffins (10)
41. E.o.L. starting snakes (50)
42. E.o.L. additional snakes (10)
43. E.o.L. M.B. autofire timer (20 seconds)
44. Instructional speech (yes)
45. Disable grave marker magnet (no)
46. Disable electric chair magnet (no)
47. Disable electric chair coil (no)
48. Disable loop diverter (no)
49. Disable inline drop targets (no)
50. Combo champion (20)
51. Combo champion award (credit)
52. Combo champion awards (0)
53. Shaker motor [optional] (Maximal Use)
54. Abort animations (one)
55. Attract mode radio (no)
56. Music volume (0)
57. Speech volume (0)
58. General illumination intensity (50)

There were no release notes in the zip file, this is information I typed in.

Instructional speech is currently adjustment #44 so unless something changes I would guess you'd be fine.